The Collaborative International Dictionary of English v.0.48:
Distain \Dis*tain"\, v. t. [imp. & p. p. Distained; p. pr. &
vb. n. Distaining.] [OE. desteinen, OF. desteindre to take
away the color, F. d['e]teindre; pref. des- (L. dis-) + F.
teindre to tinge, dye, L. tingere. See Tinge, and cf.
To tinge with a different color from the natural or proper
one; to stain; to discolor; to sully; to tarnish; to defile;
-- used chiefly in poetry. "Distained with dirt and blood."
[She] hath . . . distained her honorable blood.
The worthiness of praise distains his worth. --Shak.